Timer



S. E. SELLECK.

TIMER.

APPLICATION FILED MAR. I1. 1920- Patented Dec. 6, 1921.

amen to;

I abbo'uwu UNITED STATES PATENT OFFICE.

SILAS E. SELLECK, 0] GOLD SPRING, NEW YORK, ASSIG-NOR- OF ONE-THIRD TO THEODORE. J. SELLEGK, OF GOLD SPRING, NEXV YORK.

TIMER.

Specification of Letters Patent.

Patented Dec. 6, 1921.

T 0 all whom it may concern Be it known that I, SrLAs E. SELLECK, a citizen of the United States, and resident of Cold Spring, in the county of Putnamand State of New York, have invented certain new and useful Timers, of which the follow ing is a specification.

This invention relates to the distribution of currents from magnetos and other devices from which electric currents are intermittently taken; and it has for its object means for making contacts that shall be smooth running, free from vibrations, and free from the wear that results in most rolling and rubbing contacts. The objects are attained by the means set forth in this specification and the accompanying drawings, in both of which like letters and numerals refer to similar parts. The invention belongs to the class of current distributers known as timers.

Referring to the drawings, Figure l is a front elevation of the timer. Fig. 2 is a side elevation of the timer partly in section. Fig. 3 is a longitudinal section through the line B in Fig. 1. Fig. 4 is a front elevation of the eccentric, partly in section.

This invention is shown as applied to a well known form of automobile magneto in which the timer is attached to the end of the magneto shaft, which end is housed in a casing attached to the magneto, the casing embodying current distributing contact points. The casing is represented in the drawings at b, and in Fig. '3 it is represented as attached to a magneto plate A. b represents the casing havlng a rin a of insulating fiber inserted therein, as in igs. 1 2 3. Set in the fiber are metal contact plates Z that have insulated screw extensions as at Z to the outside of the casing, with nuts 12. thereon for the attachments of distributing wires. The screw extension is shown by broken lines at Z, Fig. 1, and the insulation through the rim of the casing at n. The other features to be described are the features that constitute this invention.

In Fig. 1 it will be observed that a floating ring 2' has a rolling contact with the interior of the fiber ring a, which ring includes the contact plates Z, the rolling impelled by a revolving eccentricf that is thrust against the ring. A side view of the floating ring is shown in Fig. 2, and a longitudi nal section of the ring in Fig. 3. The ring 2' s uppor d n a conical p the ged edge 79 of the cup being fast to the ring. At the apex of the cup it is perforated to re carve a stud or screw, as s, Fig. 3. The screw holds the cup in place butfadmits of the cup swinging loosely onthe screw as a pivot. The ring is slightly conical so thatinany of its contacting positions it will present parallel faces to the other elements, as shown in Figs. 2 and 3.

The shaft 0 is the magneto shaft and extends into the casing b and has an extension 0 with a shoulder 42, and the screw-nut h on the end of the extension, the extension designed for the attachment of contact trailers. Instead of the usual trailers, there is shown an eccentric f, of which a detailed elevation is given in Fig. 4, a reverse elevation in Fig. 1, and a transverse section in Fig. 3. The eccentric is slotted to receive a block d, the block applicable to the shaft extension. The eccentric is slidable on the block in the direction of the length of the slot, and is held between the shoulder '22 on the shaft and a flange c on the block. A hub t on the block is notched as at 4: 4:, Figs. 3 and 4:, and a pin 4'' through the shaft and the notches secures the eccentric in position with respect to proper timing, and the block is further secured by the screw-nut 72.. The cup-washer j secures the pin 1" from displacement. Between the outer end of the slot 1 in the eccentric, and the outer end of the block, a spring 6 is applied, the ends of the spring engaging with recesses 2 and 3, Fig. 4. Balls m and a ring 9 inclose the eccentric f and give to the eccentric a ballbearing periphery.

When the ring 2' is in place and the eccentric is inserted within it, the spring 6 forces contact between the eccentric and the ring, and forces the ring 2' against the fiber ring a, as shown in Fig. l. Revolving the eccentric moves this point of contact between the rings all around the circle of the ring a with a rolling motion. An electric current coming in through the shaft would pass through these devices and out through the contact plates in the fiber ring. The ballbearing surface ring on the eccentric makes all the movements rolling motions, and there is no rubbing of any of the contacts. The motions are smooth and uniform, and not only obviate uneven wearing of parts, but they practically eliminate wear.

The cup 0 may be held with a round pivot,

as at s in F ig. 3, or it may be held loesely by a square stud as at s in Fig, 2. There is very littlelinclinaticn ofthering to rotate. 'l/Vhile this invention is hereindescribed in connection with a part of a"timer that is common it is to be understood that it is not to be so limited, and that the casing feature can be a frame-eta Very difi'erent deframe and contact pointsin said insulator, with afloating ring a cup attachment to the ringanda pivpt in 'thefapex ofthe cuppa "shait extensionwithin the frame; aneccentricg a blocl: a diarhetral slct in the eccentric, the block fast on the shaft, the eccentric :being slidablyadjustable v,cn the block, a spring betWeen-theblcck and the eccentric in the slot space, and a ball-bearing peripheral ring on the eccentric.

2; Thecomblnatlon with an lnsulatednng and contact points 1n sald r1ng, ,ofa floating ring, cup means for retaining the floating ring in place, a shaft, a block on the shaft a slotted eccentric adjusted on the block and slidable in a ,diametral direction,

a springflbetweentheblock and the eccen tric in the slotted space, and a ball-bearing V peripheral ring on the eccentric.

sI A's SELLECK. 

